The Experiments

Try the granularity check (in memory only, never saved):

Try it yourself (shown once, never saved):

Why one try can’t tell you: you knew what you were trying and what you hoped would happen, and no one else lived the same day without doing it. That is why studies use many people, a comparison group, and often keep people from knowing which group they are in. For a class version: hand out sealed cards (“do it” or “don’t”), then everyone rates the same thing the same way afterwards on unsigned slips, and you compare the two groups’ averages. The cards decide who does it at random; they don’t hide it.